Portion of a display screen with a user interface



FIG. 1 is a front view of a user interface for a portion of a display screen showing the claimed design; and,

FIG. 2 is a front view of a user interface for a portion of a display screen showing the claimed design in accordance with a second embodiment.

The portions of the user interface illustrated in broken lines form no part of the claimed design. The outer edge of the portion of the display screen is understood to be congruent with the outer edge of the user interface. 

CLAIM The ornamental design for a portion of a display screen with a user interface, as shown and described. 